See how he ran

Dean Karnazes loves to run . . . and run . . . and run. In fact, the 26.2-mile marathons that represent the pinnacle of athletic achievement for many runners are for Karnazes a typical weekend workout. (Those curious about how he fits all that mileage into a busy life might want to read his first book, the best-selling Ultramarathon Man: Confessions of an All-Night Runner.) In 2006, Karnazes...